Rock-drill.



No. 690,630. v Patented Ian. 7, I902.

A. C. BATES.

ROCK DRILL.

(Applicatign filed Apr. 6, 1901.!

(No Model.) 4 Sheets-Sheet l.

. ATTORNEY.

Patented Jan. 7, I902.

' A. CQ-BATES.

BOOK DRILL.

(Application filed Apr. 6, 1901.

4 Sheets -Shaet 2.

l/YVENTOR.

ATTORNEY.

Patented Jan. 7, I902.- A. C. BATES.

ROCK DRILL.

(Application filed 8, 1901.)

4 Sheets8he'et 3.

(No Model.)

' INVENTO/f. MW 6m WITNESSQS': 1M

ATTORNEY.

Wm W 4 No. 690,630. Patented Jan. 7, 902.

A. c. BATESQ ROCK DRILL.

- (Applieafion filed Apr. 6, 1901.} v (No Model.) 4 Sheets-Sheet 4.

WITNESSES lNVlzNTO/B.

am WWW- M? @064 wwzm iiz y A TTORNZ Y.

UNITED STATES PATE T OFFIQE.

ARTHUR C. BATES, OF SAN FRANCISCO, CALIFORNIA.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 690,630, dated January7, 1902.

Application filed April 6 1901.

To call whom it may concern: Be it known that I, ARTHUR C. BATES, acitizen of the United States, residing at the city of San Francisco, inthe county of San Francisco and State of California, have inventedcertain new and useful Improvements in Rock-Drills, of which thefollowing is a specification.

My invention relates to improvements in rock-drills.

The objects of the said invention are to provide a rock-drill wherebythe'j arrin g or straining heretofore experienced in the use of suchmachines is obviated and the drill is twisted automatically before thestriking of a blow, as well as released from twisting should it stick inthe drilled hole, and which mechanism may be adjusted so as admit ofoperation at any desired angle and accomplishes the art of drilling withease and rapidity, such invention being illustrated in the accompanyingdrawings and set forth and pointed out in the following specificationand appended claims, the said machine beingpreferably constructed ofsteel and iron.

As to the drawings, Figure l is a side elevation of the drill and frame.view of the top of thedrill-box. Fig. 3 is a' longitudinal sectionthrough the drill box with the side of said box and crank removed. Fig.4 is a transverse section looking toward 0 of Fig. 3, through point is.Fig. 4 is an elevation of the driving-crank. Fig. 5 shows the boltattachment hereinafter mentioned. Fig.

5 is a plan of the clamp. Fig. 6 shows the post, tripod, or frame-screwjoint to raise or lower the drill to the desired position.

In the figures as shown in the accompanying drawings, reference theretobeing had, a represents the frame of the machine. b represents the coverto the same secured thereto by screws. A cap to regulate the pressure onthe spiral spring dis shown at c. The washer e in contact with said cap,having its outward side provided with a centrally-positioned knob, soaccommodates itself with'said cap as to keep the spring in its properposition. The plunger f, being a continuation of the spring-case, hasits end threaded, so as to admit of the firm attachment thereto of thecollar g,which secures the drill, by means of set-screws.

h represents packing for preventing the es- Fig. 2 is a plan Serial No.64,759., (No model.)

cape 'of compressed air. The holes admit air in the chamber-spacebetween it and t' when camj in compressing the spring d has forced backthe spring-case so that the lugs thereof are beyond the holes. Upon therelease of the plunger f from cam'j at point 1 compressed air is formedin the chamber-space aforesaid after the passing of the flange or headof the spring-case beyond such holes and toward the packing mentioned.

It represents the cam-shaft, and t the shaft of the balance-wheel y, andm shows spur-- gearing for the movement of the balance u toward cam tand the pawl u'engaging with.

the teeth'of the wheel to for the revolution of such wheel.

a; mellow a threaded bolt to fit'carriage s, and-z set-screws andpacking-rings for tightening parts. The bolt m :20 (shown in Fig. 5) isthreaded so as to fit carriage s, as shown in Fig. 3, at place marked m00-, and the drill-box is thereby adjustable, so that a hole may bedrilled at any angle, such bolt being attachable to a post, tripod, orframe admitting of the drill being operated either in a tunnel or on thesurface.

To operate the machine, it is first secured and adjusted in the tunnel,as desired. The crank 10 is then turned, causing shaft is torevolve andwith it camsj and t and wheel m,

cam j in its revolution from the inner point 2, as shown in Fig. 3, tothe outer point 2, describing a semicircle and forcing back plungerf andcompressing spring at until the latter point is attained, when theplunger being released the resilience of the spring forces the drillagainst the rock to be drilled, the operation being repeated by thecoming into position of the remaining half of the camwheel, the turningof the latter also causing the sprockets at to enter the pockets 0, im-

TOO

partinga twisting movement to the drill and the following disengagementsof the sprockets being advantageous in the event of the drill becomingfixed in the aperture. The formation of a cushion of compressed air, ashereinbefore described, and the creation of air-pressure relieves ahand-operating or electric drill-machine from jarring at the time ofimpact of the drill, stops the vibration of the spring, and isparticularly beneficial in removing the sudden strain on the arm of theoperator or any other power for the Working of the same heretoforeexperienced in the use of other machines for drilling rock. Therevolution of the cam talternately depresses and allows to rebound bythe action of spring '0, part a of the feed attachment imparting areciprocating motionto rod to and causing pawl u to become engagedsuccessively with the teeth of wheel to for the revolution of the latterand the consequent forwardmovement of the machine. It should be addedthat the cam-shaft may be operated by being geared to a counter-shaft,if desired.

Having thus-described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In arock-drill a machine-casing having a forward and rearchamber,said forward chamber inclosing parts of its mechanism and said rearchamber being provided with vents for admitting air therein, a plungerprovided with a recess for inclosing a spring to drive it forward andhaving a flange or head at the mouth of said recess adapted to fitclosely against the walls of said rearchamber so as to permit of theformation of a cushion of compressed air between said flange or head andthe forward inclosed part of said rear chamber surrounding the recessedportion of said plunger slidable therein, in combination with acam-wheel having two parts for successively forcing back said plungerand compressing said spring and suddenly releasing the same, and havingspurs on the rim thereof to act in conjunction with pockets in saidplunger opposite thereto for twisting the same, a cam adaptedconsecutively to act upon and release a feed attachment provided with apawl arranged to engage the teeth of a ratchet-wheel attached to afeed-screw for the forward movement of the machine, substantially asdescribed.

2. In arock-drilla machinecasing havinga forward and rear chambersaidforward chamber inclosing parts of its mechanism and said rear chamberbeing provided with vents for admitting air therein, a plunger providedwith an open recess for inclosing a spiral spring to drive it forwardthe ends of said spring resting against metallic Washers having theirouter sides provided with centrallypositioned rounded knobs so as topermit of the proper adjustment of the spring, the forward washer beingin contact with the inner inclosed end of said recess, the rear washerbeing in contact with the threaded movable eeo,eeo

cap to regulate the spring-pressure said plunger having a flange or headat the month of said recess adapted to fit closely against the Walls ofsaid rear chamber so as to permit of the formation of a cushion ofcompressed air between said projections or lugs and the forward inclosedpart of said rear chamber surrounding the recessed portion of saidplunger slidable therein, in combination with a camwheel having twoparts for successively forcing back said plunger and compressing saidspring and suddenly releasing the same and having sprockets on the rimthereof to actin conjunction with pockets in said plunger oppositethereto for twisting the same, a,cam adapted consecutively to act uponand release a feed attachment provided with a pawl arranged to engagethe teeth of a ratchetwheel attached to a feed-screw for the forwardmovement of the machine,substantially as described.

3. In a rock-drill a machine-casing having a front and a rear chamber,said front chamber containing a main shaft and a cam-wheel and gearingfor the movement of a balance-wheel attached to a counter-shaft, aplunger for the working of a drill operating through the same, saidplunger consisting of a shaft provided with a collar for holding a drilland having a recess in its rear end for holding a spring for drivingsaid plunger forward, said plunger at the mouth of said recess having aflange or head presenting a straight surface to the inner sides of saidrear chamber and slidable against said sides, the front wall of saidrear chamber having an opening for the operation of the rear section ofsaid plunger therein and the inner surface of said wall being inclosedby expansible packing so as to prevent the escape of compressed air fromthe cushion thereof formed on the release of said spring, between thesaid lugs and said packing opposite thereto,said rear chamber havingvents in its sides and the rear wall thereof consisting of a threadedcap adjusted to the opening of said rear chamber for the shortening ofsaid spring as may be desired, in combination with a cam-wheel havingtwo parts for.

successively forcing back said plunger compressing said spring andsuddenly releasing the same and having spurs on the rim thereof to actin conjunction with the pockets in said plunger opposite thereto forturning the same, a cam adapted to act upon and release a feedattachment provided with a pawl arranged to engage the teeth of aratchetwheel attached to a feed-screw for the forward movement of themachine, said feed attachment consisting of a centrally-pivoted bar, arectangular block having a slot, a thumbscrew securing said block tosaid bar through said slot said bar having an angular branch and saidpawl being pivotally connected therewith substantially as described.

4. In a rock-drilla machine-casing having a forward chamber and a rearchamber, a plunger with means for holding a drill, said plunger movingthrough apertures of said chambers and actuated bya spring to drive itforward, said plunger provided with an open recess containing a springhaving rear lateral extensions presenting a straight surface to theinner sides of said rear chamber and moving in contact therewith thefront walls of the said front and rear chambers having an aperture forthe movement of said plunger therein and the inner surface of said wallbeing inclosed by expansible packing so as to prevent the escape ofcompressed air from the cushion thereof formed on the release of saidspring for the propulsion of said plunger between said extensions andsaid packing opposite thereto said rear chamber having vents in itssides and the rear Wall thereof consisting of a threaded cap adjusted tothe opening of said rear chamber for the shortening of said spring asdesired, in combination with a cam-wheel having two parts forsuccessively forcing back said plunger and compressing said spring andsuddenly releasing the same and having spurs on the rim thereof to actin conjunction-with the pockets in said plunger opposite thereto forturning the same, a cam adapted to act upon and release a feedattachment provided with a pawl arranged to engage the teeth of aratchet-Wheel attached to a feed-screw for the forward movement of themachine, said feed-screw having a handle for the backward movement ofthe same, and said machine having means for the regulation of the sameand its adjustment to any angle or position desired,substantially asdescribed.

5. In a rock-drill a machine-casing havinga forward chamber and a rearchamber said forward chamber inclosing parts of its mechanmonth of saidrecess adapted to fit closely against the inner sides of saidrearchamber and so as to permit of the formation of a cushion ofcompressed air between said projections and the forward inclosed partsof said rear chamber surrounding the recessed portion of said plungerslidable therein, in combination with a cam-wheel having two parts forforcing back said spring and suddenly releasing the same and havingspurs on the rim thereof to act in conjunction with pockets in saidplunger opposite thereto for turning the same,a cam adapted to act uponand release a feed attachment provided with a pawl having a springbearing against the same and arranged to engage the teeth of aratchet-wheelattached to a feed-screw for the forward movement of themachine and said feed attachment consisting of a centrally-pivoted barand spring, a rectangular block having a slot, a thumb-screw securingsaid block to said bar through said slot and said bar having an angularbranch, said pawl being pivotally connected therewith substantially asand for the purpose described.

6. In a rock-drill a machine-casing having a front and a rear chamberand containing a plunger having a flange or head presenting a straightsurface to the inner sides of said rear chamber and slidable againstsaid sides, the front wall of said rear chamber having an opening forthe operation of the rear section of said plunger thereinand the innersurface of said wall being inclosed by expansible packing so as toprevent the escape of compressed air from the cushion thereof formed onthe release of the spring contained within the recess in the rearsection of said plunger between the said flange or head and said packingopposite thereto, and said rear chamber having vents in its. sides foradmitting air therein, such cushion being formed to prevent the jarringof the machine in the operation thereof all substantially as shown anddescribed.

In testimony whereof I affix my signature in presence of two witnesses.

ARTHUR O. BATES. Witnesses:

JAMES F. HOUGH, GEO. W. STEWART.

